#nav{ height:32px;}
#nav .top{ float:left; width:115px; text-align:center; position:relative; zoom:1;}
#nav .top_link{ height:32px; color:#000; display:block; font:18px/32px "微软雅黑","宋体",Arial;}
#nav .top_link:hover{ color:#fff; background:url(bg2.gif) no-repeat; text-decoration:none;}
#nav li:hover{ position:relative; z-index:200;}
#nav .new{ background:url(new.png) no-repeat; width:21px; height:12px; position:absolute; left:80px; top:0; overflow:hidden; text-indent:-888px;}

#nav ul, 
#nav li:hover ul ul,
#nav li:hover ul li:hover ul ul,
#nav li:hover ul li:hover ul li:hover ul ul,
#nav li:hover ul li:hover ul li:hover ul li:hover ul ul{ position:absolute; left:-9999px; top:-9999px;}
#nav li:hover ul.sub{ left:0; top:31px; background:#fff; padding:4px; border:1px solid #3a93d2; width:105px; z-index:300;}
#nav li:hover ul.sub li{ height:20px;}
#nav li:hover ul.sub li a{ display:block; font-size:14px; line-height:20px; color:#000; text-decoration:none;}
#nav li:hover ul.sub li a:hover{ background:#3a93d2; color:#fff;}